HARQ Combining Cell Group for Multi-Path Wireless Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving low-latency and high-reliability data communication, particularly in multi-path environments, where error recovery and data transmission efficiency are compromised due to the limitations of existing HARQ methods.
Innovation Solution
The proposed method involves a user equipment (UE) that receives initial data from a primary eNB and retransmission data from a secondary eNB, combines and decodes these data, and feeds back the results through one or both radio links, utilizing a combining cell group (CCG) to enhance error recovery and reduce transmission time by configuring a CCG with an HARQ-related timer to manage data receipt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted through multiple paths using multi-path HARQ, then data reception reliability is improved, but device complexity increases due to the need to manage multiple radio links and combining cell groups
Solution Approach 1:
The patent segments the HARQ process by introducing combining cell groups (CCGs) that separately manage different radio links. Each CCG handles specific cell groups independently, allowing the UE to process multiple paths without overwhelming complexity. The segmentation of HARQ-ACK feedback into separate CCGs enables independent management of each transmission path.
Solution Approach 2:
The patent introduces combining cell groups as intermediary structures that mediate between multiple radio links and the HARQ process. These CCGs act as organizational layers that simplify the management of complex multi-path transmissions by grouping cells and their associated HARQ processes together.
2Reliability
If retransmission data is received from multiple eNBs through different radio links, then error recovery speed is improved, but loss of time increases due to the need to combine and decode data from multiple sources
Solution Approach 1:
The patent implements preliminary actions by configuring combining cell groups and HARQ processes in advance before actual data transmission. The UE is pre-configured with multiple CCGs and their associated radio links, so when retransmissions are needed, the combining and decoding can immediately proceed without setup delays. The HARQ-related timer is also pre-configured to manage the timing of these operations.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining multiple active HARQ processes across different CCGs simultaneously. Instead of sequentially processing retransmissions from different eNBs, the UE can continuously receive, combine, and decode data from multiple radio links in parallel, eliminating idle time between operations.
3Productivity
If HARQ-related timer is used to manage data receipt from multiple paths, then productivity is improved through efficient resource management, but device complexity increases due to timer management and coordination overhead
Solution Approach 1:
The patent segments timer management by associating HARQ-related timers with specific combining cell groups rather than managing all timers centrally. Each CCG can independently manage its own timer, allowing parallel and independent timing control for different radio links, which improves resource management efficiency while distributing the management complexity.
Data Source
AI summary
In this specification, a method of performing a hybrid automatic request (HARQ) in a wireless communication system is performed by a user equipment, and includes receiving first data from a first eNB through a first radio link; receiving second data from at least one second eNB through a second radio link; combining the first data and the second data; decoding the combined data; and feedbacking the results of the decoding through at least one of the first radio link or the second radio link.